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The model, which applies to many fish species, simulates one to nine mackerel being propelled forward by their tail fins.

The rudder is a movable panel on a jet’s vertical tail fin that can deflect to one side so the air pressure on the panel turns the plane’s nose to the right or left.

He was fired last year for allegedly failing to conduct inspections that were his responsibility, resulting in faulty tail fin fittings being shipped to Boeing.

If the door plug that blew off had struck and damaged the horizontal tail or the tail fin, the pilots could have lost control and the jet could have crashed.

"None has four large flippers they use in conjunction with a tail fin."